diff --git a/deps.edn b/deps.edn
index ff024e61..ab9af51a 100644
--- a/deps.edn
+++ b/deps.edn
@@ -69,7 +69,8 @@
                          honeysql/honeysql {:mvn/version "1.0.444"}
                          minimallist/minimallist {:mvn/version "0.0.6"}
                          circleci/bond {:mvn/version "0.4.0"}
-                         version-clj/version-clj {:mvn/version "0.1.2"}}}
+                         version-clj/version-clj {:mvn/version "0.1.2"}
+                         gaka/gaka {:mvn/version "0.3.0"}}}
            :clj-nvd
            {:extra-deps {clj-nvd/clj-nvd {:git/url "https://github.com/miikka/clj-nvd.git"
                                           :sha "f2ec98699e057a379baf170cb49cf7ad76874a70"}}
diff --git a/doc/projects.md b/doc/projects.md
index 5ef20e22..4b41d311 100644
--- a/doc/projects.md
+++ b/doc/projects.md
@@ -399,6 +399,41 @@ Library for managing environment variables in Clojure.
 (prn (:path env))
 ```
 
+### [gaka](https://github.com/cdaddr/gaka)
+
+``` clojure
+(ns script
+  (:require [babashka.deps :as deps]))
+
+(deps/add-deps '{:deps {gaka/gaka {:mvn/version "0.3.0"}}})
+
+(require '[gaka.core :as gaka])
+
+(def rules [:div#foo
+            :margin "0px"
+            [:span.bar
+             :color "black"
+             :font-weight "bold"
+             [:a:hover
+              :text-decoration "none"]]])
+
+(println (gaka/css rules))
+```
+
+Output:
+
+``` css
+div#foo {
+  margin: 0px;}
+
+  div#foo span.bar {
+    color: black;
+    font-weight: bold;}
+
+    div#foo span.bar a:hover {
+      text-decoration: none;}
+```
+
 ## Pods
 
 [Babashka pods](https://github.com/babashka/babashka.pods) are programs that can
diff --git a/test-resources/lib_tests/babashka/run_all_libtests.clj b/test-resources/lib_tests/babashka/run_all_libtests.clj
index c331d749..f125d1df 100644
--- a/test-resources/lib_tests/babashka/run_all_libtests.clj
+++ b/test-resources/lib_tests/babashka/run_all_libtests.clj
@@ -176,6 +176,8 @@
 
 (test-namespaces 'test-check.smoke-test)
 
+(test-namespaces 'gaka.core-test)
+
 ;;;; final exit code
 
 (let [{:keys [:test :fail :error] :as m} @status]
diff --git a/test-resources/lib_tests/gaka/core_test.clj b/test-resources/lib_tests/gaka/core_test.clj
new file mode 100644
index 00000000..7084eee4
--- /dev/null
+++ b/test-resources/lib_tests/gaka/core_test.clj
@@ -0,0 +1,196 @@
+(ns gaka.core-test
+  (:require [clojure.test :refer [deftest is #_are]]
+            [gaka.core :refer [css compile* inline-css render-rule]]
+            ))
+
+(defmacro =? [& body]
+  `(clojure.test/are [x# y#] (= x# y#)
+        ~@body))
+
+(deftest test-flatten
+  (let [flatten-seqs #'gaka.core/flatten-seqs
+        flatten-maps #'gaka.core/flatten-maps
+        flatten-keyvals #'gaka.core/flatten-keyvals]
+   (=? (flatten-seqs [1 '(2 3)])
+       [1 2 3])
+
+   (=? (flatten-seqs [1 '(2 [3 (4)])])
+       [1 2 [3 '(4)]])
+
+   (=? (flatten-seqs [1 '(2 (3 (4)))])
+       [1 2 3 4])
+
+   (=? (flatten-seqs [1 '(2 3 [4])])
+       [1 2 3 [4]])
+
+   (=? (flatten-maps [1 2 {3 4}])
+       [1 2 3 4])
+
+   #_(=? (flatten-maps [1 {2 3 4 5} 6])
+       [1 2 3 4 5 6])
+
+   (=? (flatten-keyvals [1 '(2 {3 4} 5)])
+       [1 2 3 4 5])
+
+   (=? (flatten-keyvals [1 [2 {3 4}]])
+       [1 [2 {3 4}]])
+
+   (=? (flatten-keyvals [1 '([2] 3 [4] {5 6})])
+       [1 [2] 3 [4] 5 6])
+))
+
+(deftest test-compile*
+  (=? (compile* []  [:a])
+      [{:selector ["a"]
+        :keyvals []}]
+
+      (compile* []  [:a :color :red])
+      [{:selector ["a"]
+        :keyvals [:color :red]}]
+
+      (compile* []  [:a {:color :red}])
+      [{:selector ["a"]
+        :keyvals [:color :red]}]
+
+      (compile* []  [:a :color :blue {:color :red}])
+      [{:selector ["a"]
+        :keyvals [:color :blue :color :red]}]
+
+      (compile* []  [:a {:color :red} :color :blue])
+      [{:selector ["a"]
+        :keyvals [:color :red :color :blue]}]
+
+      (compile* [] [:a [:img :border :none]])
+      [{:selector ["a"]
+        :keyvals []}
+       {:selector ["a" "img"]
+        :keyvals [:border :none]}]
+
+      (compile* [] [:div [:a [:img :border :none]]])
+      [{:selector ["div"]
+        :keyvals []}
+       {:selector ["div" "a"]
+        :keyvals []}
+       {:selector ["div" "a" "img"]
+        :keyvals [:border :none]}]
+
+      (compile* [] [:div (list :border :none)])
+      [{:selector ["div"]
+        :keyvals [:border :none]}]
+
+      (compile* [] [:div ["a, img" :border :none]])
+      [{:selector ["div"]
+        :keyvals []}
+       {:selector ["div" "a"]
+        :keyvals [:border :none]}
+       {:selector ["div" "img"]
+        :keyvals [:border :none]}]))
+
+(deftest test-mixins
+  (=? (let [mixin (list :color :red)]
+        (compile* [] [:a mixin]))
+      [{:selector ["a"]
+        :keyvals [:color :red]}]
+
+      (let [a (list [:a :color :red])]
+        (compile* [] [:div a]))
+      [{:selector ["div"]
+        :keyvals []}
+       {:selector ["div" "a"]
+        :keyvals [:color :red]}]
+
+      (let [mixin {:color :red}]
+        (compile* [] [:div mixin]))
+      [{:selector ["div"]
+        :keyvals [:color :red]}]
+
+      (let [mixin {:color :red}]
+        (compile* [] [:div [:a mixin]]))
+      [{:selector ["div"]
+        :keyvals []}
+       {:selector ["div" "a"]
+        :keyvals [:color :red]}]
+
+      (let [mixin (list :color :red)
+            els (list [:a mixin] [:span mixin])]
+        (compile* [] [:div els]))
+      [{:selector ["div"]
+        :keyvals []}
+       {:selector ["div" "a"]
+        :keyvals [:color :red]}
+       {:selector ["div" "span"]
+        :keyvals [:color :red]}]
+
+      (let [mixin (list :color :red {:border :none})
+            els (list [:a mixin] :color :blue [:span mixin])]
+        (compile* [] [:div els]))
+      [{:selector ["div"]
+        :keyvals [:color :blue]}
+       {:selector ["div" "a"]
+        :keyvals [:color :red :border :none]}
+       {:selector ["div" "span"]
+        :keyvals [:color :red :border :none]}]))
+
+(deftest test-render-rule
+  (=? (render-rule {:selector ["a"] :keyvals [:color :red]})
+      "a {\n  color: red;}\n\n"
+
+      (render-rule {:selector ["a"] :keyvals [:color :red :border :none]})
+      "a {\n  color: red;\n  border: none;}\n\n"
+
+      (render-rule {:selector ["a" "img"] :keyvals [:border :none]})
+      "  a img {\n    border: none;}\n\n"))
+
+(deftest test-css
+  (=? (css nil)
+      ""
+      
+      (css [:a :color :red [:img :border :none]])
+      "a {\n  color: red;}\n\n  a img {\n    border: none;}\n\n"
+
+      (css [:a {:color :red} [:img {:border :none}]])
+      "a {\n  color: red;}\n\n  a img {\n    border: none;}\n\n"
+
+      (css [:a :color :red [:img :border :none] :font-style :italic])
+      "a {\n  color: red;\n  font-style: italic;}\n\n  a img {\n    border: none;}\n\n"
+
+      (css [:body
+            :padding 0
+            [:div#foo
+             [:a :color :red]]
+            :margin 0
+            [:div#bar
+             [:a :color :blue]]
+            :border 0])
+      "body {\n  padding: 0;\n  margin: 0;\n  border: 0;}\n\n    body div#foo a {\n      color: red;}\n\n    body div#bar a {\n      color: blue;}\n\n"))
+
+(deftest test-css-no-indent
+  (binding [gaka.core/*print-indent* false]
+   (=? (css nil)
+       ""
+      
+       (css [:a :color :red [:img :border :none]])
+       "a {\ncolor: red;}\n\na img {\nborder: none;}\n\n"
+
+       (css [:a {:color :red} [:img {:border :none}]])
+       "a {\ncolor: red;}\n\na img {\nborder: none;}\n\n"
+
+       (css [:a :color :red [:img :border :none] :font-style :italic])
+       "a {\ncolor: red;\nfont-style: italic;}\n\na img {\nborder: none;}\n\n"
+
+       (css [:body
+             :padding 0
+             [:div#foo
+              [:a :color :red]]
+             :margin 0
+             [:div#bar
+              [:a :color :blue]]
+             :border 0])
+       "body {\npadding: 0;\nmargin: 0;\nborder: 0;}\n\nbody div#foo a {\ncolor: red;}\n\nbody div#bar a {\ncolor: blue;}\n\n")))
+
+(deftest test-inline-css
+  (=? (inline-css :color :red :border 1)
+      "color: red; border: 1;")
+  (is
+   (re-find #"^(color: red; border: 1;|border: 1; color: red;)$"
+            (inline-css {:color :red :border 1}))))